A coupled-channel extension of the unquenched quark model with one per-multiplet subtraction parameter predicts that χc(2P) states, especially the X(3872), have large molecular components while χb(3P) states are almost pure bottomonia.
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Threshold Effects in Heavy Quarkonium Spectroscopy and Decays
A coupled-channel extension of the unquenched quark model with one per-multiplet subtraction parameter predicts that χc(2P) states, especially the X(3872), have large molecular components while χb(3P) states are almost pure bottomonia.